package com.sky.service.impl;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.metadata.fill.FillConfig;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * TODO
 *
 * @Author katana
 * @Date 2025/5/25 22:03
 */
@Service
public class ReportServiceImpl implements ReportService {
    
    @Autowired
    private OrderMapper orderMapper;
    
    @Autowired
    private UserMapper userMapper;
    
    @Autowired
    private WorkspaceService workspaceService;
    
    /**
     * 根据时间区间统计营业额
     *
     * @param beginTime
     * @param endTime
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate beginTime, LocalDate endTime) {
        List<LocalDate> dateList = getDateList(beginTime, endTime);
        
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime begin = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime end = LocalDateTime.of(date, LocalTime.MAX);
            Map<String, Object> map = new HashMap<>();
            map.put("status", Orders.COMPLETED);
            map.put("begin", begin);
            map.put("end", end);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        
        TurnoverReportVO turnoverReportVO = new TurnoverReportVO();
        turnoverReportVO.setDateList(StringUtils.join(dateList, ","));
        turnoverReportVO.setTurnoverList(StringUtils.join(turnoverList, ","));
        //数据封装
        return turnoverReportVO;
    }
    
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);
        List<Integer> newUserList = new ArrayList<>(); //新增用户数
        List<Integer> totalUserList = new ArrayList<>(); //总用户数
        
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = getUserCount(beginTime, endTime);
            //总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = getUserCount(null, endTime);
            
            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }
        
        UserReportVO userReportVO = new UserReportVO();
        userReportVO.setDateList(StringUtils.join(dateList, ","));
        userReportVO.setTotalUserList(StringUtils.join(totalUserList, ","));
        userReportVO.setNewUserList(StringUtils.join(newUserList, ","));
        return userReportVO;
    }
    
    /**
     * 获取指定时间区间内的日期列表
     *
     * @param begin
     * @param end
     * @return
     */
    private static List<LocalDate> getDateList(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }
    
    /**
     * 根据时间区间统计用户数量
     *
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map<String, Object> map = new HashMap<>();
        map.put("begin", beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }
    
    /**
     * 根据时间区间统计订单数量
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);
        
        //每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        //每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            
            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        
        //时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        OrderReportVO orderReportVO = new OrderReportVO();
        orderReportVO.setDateList(StringUtils.join(dateList, ","));
        orderReportVO.setOrderCountList(StringUtils.join(orderCountList, ","));
        orderReportVO.setValidOrderCountList(StringUtils.join(validOrderCountList, ","));
        orderReportVO.setTotalOrderCount(totalOrderCount);
        orderReportVO.setValidOrderCount(validOrderCount);
        orderReportVO.setOrderCompletionRate(orderCompletionRate);
        return orderReportVO;
    }
    
    /**
     * 根据时间区间统计指定状态的订单数量
     *
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map<String, Object> map = new HashMap<>();
        map.put("status", status);
        map.put("begin", beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }
    
    
    /**
     * 查询销量排名top10
     *
     * @param begin
     * @param end
     * @return
     **/
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<Map<String, Object>> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        String nameList = StringUtils.join(salesTop10.stream().map(x -> x.get("name")).collect(Collectors.toList()), ",");
        String numberList = StringUtils.join(salesTop10.stream().map(x -> x.get("number")).collect(Collectors.toList()), ",");
        SalesTop10ReportVO salesTop10ReportVO = new SalesTop10ReportVO(nameList, numberList);
        salesTop10ReportVO.setNameList(nameList);
        salesTop10ReportVO.setNumberList(numberList);
        return salesTop10ReportVO;
    }
    
    
    /**
     * 导出营业数据
     *
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        
        // 查询数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        List<BusinessDataVO> dailyData = new ArrayList<>();
        
        for (int i = 0; i < 30; i++) {
            LocalDate date = begin.plusDays(i);
            BusinessDataVO data = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
            data.setDate(date);
            dailyData.add(data);
        }
        
        try {
            // 设置响应头
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode("运营数据报表.xlsx", StandardCharsets.UTF_8));
            
            // 加载模板
            InputStream templateStream = this.getClass()
                    .getClassLoader().getResourceAsStream("template/运营数据报表模板1.xlsx");
            
            // 创建ExcelWriter
            ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream())
                    .withTemplate(templateStream)
                    .build();
            
            // 填充概览数据
            Map<String, Object> staticData = new HashMap<>();
            staticData.put("dateRange", begin + "至" + end);
            staticData.put("turnover", businessData.getTurnover());
            staticData.put("orderCompletionRate", businessData.getOrderCompletionRate());
            staticData.put("newUsers", businessData.getNewUsers());
            staticData.put("validOrderCount", businessData.getValidOrderCount());
            staticData.put("unitPrice", businessData.getUnitPrice());
            
            excelWriter.fill(staticData, EasyExcel.writerSheet().build());
            
            // 填充每日明细（列表数据）
            WriteSheet sheet = EasyExcel.writerSheet().build();
            FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();
            excelWriter.fill(dailyData, fillConfig, sheet);
            
            // 关闭资源
            excelWriter.finish();
        } catch (IOException e) {
            throw new RuntimeException("报表导出失败", e);
        }
    }
    /*public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            
            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();
            
        }catch (IOException e){
            e.printStackTrace();
        }
    }*/
}
